diff --git a/google-cloud-spanner/pom.xml b/google-cloud-spanner/pom.xml
index 561483af40..907141d6e9 100644
--- a/google-cloud-spanner/pom.xml
+++ b/google-cloud-spanner/pom.xml
@@ -162,6 +162,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>grpc-gcp</artifactId>
+      <version>1.6.2-SNAPSHOT</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractReadContext.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractReadContext.java
index 67b0638f5d..35c4f20868 100644
--- a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractReadContext.java
+++ b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/AbstractReadContext.java
@@ -62,7 +62,7 @@
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.GuardedBy;
 
-/**
+/** 
  * Abstract base class for all {@link ReadContext}s + concrete implementations of read-only {@link
  * ReadContext}s.
  */
diff --git a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java
index 0e540ea792..642f46c535 100644
--- a/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java
+++ b/google-cloud-spanner/src/main/java/com/google/cloud/spanner/spi/v1/GapicSpannerRpc.java
@@ -60,6 +60,7 @@
 import com.google.cloud.grpc.GcpManagedChannel;
 import com.google.cloud.grpc.GcpManagedChannelBuilder;
 import com.google.cloud.grpc.GcpManagedChannelOptions;
+import com.google.cloud.grpc.GcpManagedChannelOptions.GcpChannelPoolOptions;
 import com.google.cloud.grpc.GcpManagedChannelOptions.GcpMetricsOptions;
 import com.google.cloud.grpc.GrpcTransportOptions;
 import com.google.cloud.spanner.AdminRequestsPerMinuteExceededException;
@@ -584,9 +585,24 @@ private static GcpManagedChannelOptions grpcGcpOptionsWithMetrics(SpannerOptions
     if (metricsOptions.getNamePrefix().equals("")) {
       metricsOptionsBuilder.withNamePrefix("cloud.google.com/java/spanner/gcp-channel-pool/");
     }
-    return GcpManagedChannelOptions.newBuilder(grpcGcpOptions)
-        .withMetricsOptions(metricsOptionsBuilder.build())
-        .build();
+    GcpManagedChannelOptions.Builder channelOptionsBuilder =
+        GcpManagedChannelOptions.newBuilder(grpcGcpOptions)
+            .withMetricsOptions(metricsOptionsBuilder.build());
+
+    boolean isMultiplexedSessionEnabledForAllTransactions =
+        options.getSessionPoolOptions().getUseMultiplexedSession()
+            && options.getSessionPoolOptions().getUseMultiplexedSessionForRW()
+            && options.getSessionPoolOptions().getUseMultiplexedSessionPartitionedOps();
+    if (isMultiplexedSessionEnabledForAllTransactions) {
+      // When multiplexed session is enabled for all the transactions then enable dynamic channel
+      // pooling by default.
+      // TODO: What if backend throws an unimplemented error and the transactions fallback to using
+      // regular sessions? Is there a way to disable dynamic scaling on the fly?
+      GcpChannelPoolOptions.Builder channelPoolOptionsBuilder =
+          GcpChannelPoolOptions.newBuilder().setDynamicScaling(0, 100, Duration.ofMinutes(30L));
+      channelOptionsBuilder.withChannelPoolOptions(channelPoolOptionsBuilder.build());
+    }
+    return channelOptionsBuilder.build();
   }
 
   @SuppressWarnings("rawtypes")